A surgical stapling device particularly suited for endoscopic procedures is described. The device (10) includes a handle assembly (12) and an elongated body (14) extending distally from the handle assembly. The elongated body defines a longitudinal axis and has a tool assembly (17) pivotably supported on its distal end.The tool assembly is pivoted by an articulation mechanism (420) which includes a receptacle (436), a main shaft (432), a lower clutch (430), an upper clutch (428), a biasing member (426) and an articulation link (123).
